.top_head{
    width: 100%;
    height: 35px;
    border-bottom:  1px solid #e1e2e5;;
}
.top_head .exp{
    text-indent: 1em;
    margin-top: 15px;
    font-weight: 400;
}
/*头说明 ending*/
/*content starting*/
.list-icon{
    width: 100%;
    height: 500px;
}
.list-icon .icon-content{
    height: 400px;
    width: 500px;
    display: inline-block;
    margin-top: 20px;
    margin-left: 150px;
}
.icon-content .model_cont{
    width: 450px;
    height: 250px;
    margin-top: 95px;
    margin-left: 25px;
}
.fir_change{
    height: 100%;
    width: 200px;
    background-color: goldenrod;
    float: left;
}
.cen_division{
    height:100%;
    width: 50px;
    display: inline-block;
}
.cen_division .left{
    height: 100%;
    width: 24px;
    display: inline-block;
    background-color: white;
    border-right: 1px solid #e1e2e5;
}
.pre_img{
    height: 100%;
    width: 200px;
    float: right;
}
.pre_img .ori_img{
    height: 200px;
    width: 100%;

}
.icon-content .btn{
    margin-top: 10px;
    font-weight: bolder;
    font-size: 34px;
}


/*content engding*/